Deliverability audits and your grade

The 8 checks behind a domain's A–F grade, what each one protects, and the Gmail / Yahoo / Microsoft bulk-sender verdict.

A clean list still bounces if the sending domain is misconfigured. An audit grades a domain A to F across 8 checks, each failing one with a concrete recommendation, for 5 credits.

The eight checks

MX: the domain can receive mail at all; everything else is moot without it.

SPF: which servers may send as you; a missing or over-broad record invites spoofing.

DKIM: cryptographic signing, so providers can verify a message wasn't altered.

DMARC: the policy tying SPF and DKIM together; enforcement (quarantine/reject) is what the big providers want to see.

PTR: reverse DNS on the mail server's IP; missing PTR reads as infrastructure nobody owns.

DNSBL: whether the server IP sits on the common blocklists.

MTA-STS: optional but recommended: enforces TLS for mail in transit.

BIMI: optional: shows your logo in supporting inboxes once DMARC is enforced.

The bulk-sender verdict

Gmail, Yahoo and Microsoft now require authentication and list hygiene from anyone sending at volume. The audit ends with a plain pass/fail against those requirements, so you know where you stand before they tell you the hard way.

Still stuck? Open a support ticket and we'll reply in your dashboard.